Abstrak Mutu kualitas air suatu perairan sangat penting untuk menopang kelulushidupan organisme di dalamnya. Sebagai suatu sistem akuatik, penentuan status mutu air perlu dilakukan guna menjadi acuan dalam melakukan pemantauan pencemaran kualitas air. Penelitian ini bertujuan untuk mengkaji status mutu air di perairan Teluk Gorontalo. Terdapat 5 stasiun pengamatan yang dipilih berdasarkan kondisi pantai dan karakteristik ekologi Teluk Gorontalo. Pengambilan sampel parameter kualitas air

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... n di sepanjang perairan Teluk Gorontalo pada bulan Mei-Juli 2017. Prosedur pengambilan sampel berdasarkan metode baku APHA. Data kualitas air yang ada kemudian dianalisis dengan menggunakan Metode Indeks Pencemaran. Hasil penelitian menunjukkan bahwa Teluk Gorontalo memperoleh skor indeks pencemaran rata-rata 4,74. Hal ini menunjukkan status mutu Teluk Gorontalo di bulan Juni hingga Juli 2017 tergolong dalam kategori tercemar ringan. Abstract Water quality is one of aspect which very important to support living organisms. Determination of water quality status needs to be carried out as a reference to monitor water pollution of an aquatic system. This study aimed to assess the status of water quality in Gorontalo Bay. There were 5 observation stations selected based on the coastal conditions and ecological characteristics. Sampling of water quality parameters was conducted along the Gorontalo Bay during period May to July 2017. Sampling procedure based on APHA standard method. The water quality data were analyzed using Pollution Indeks method. Gorontalo Bay has Pollution Index average score of 4.74. This value showed that the quality status of the Gorontalo Bay on June-July 2017 is considered as polluted category.